Portable Toilets LLC

Portable Toilets LLC, doing business as Southern On-Site, is a small-business sole proprietorship based in Hattiesburg, Mississippi that provides portable latrine rental, delivery, and maintenance services exclusively to the Mississippi National Guard and Department of the Army as a prime contractor (100% of recent awards). The vendor operates under NAICS 429500 (Septic Tank and Related Services) and competes full-and-open without set-aside designations on most delivery orders, though the parent indefinite delivery contract carries a Total Small Business set-aside.

Southern On-Site's customer concentration is extreme. The Mississippi National Guard accounts for 120 of 123 recent awards (98% of combined potential value of $4.5 million), with the Department of the Army accounting for 2 awards worth $14 thousand and the Department of Agriculture Forest Service Region 8 representing 1 award worth $2 thousand. All work is performance in and around Hattiesburg, Mississippi, with primary focus on Camp Shelby.

The vendor holds a single master indefinite delivery contract (W9127Q19D0002) awarded July 2, 2025, with a $2 million ceiling, Total Small Business set-aside, base 12-month period plus four optional 12-month periods through November 30, 2029. Against this vehicle, 110 delivery orders have been issued carrying $1.1 million in combined potential value. A second IDC (W9127Q25DA002) carries 10 task orders worth $184 thousand. Delivery orders draw down the parent contract ceiling incrementally — recent examples include a $55,965 delivery order in December 2025 for Camp Shelby portable latrine and handwashing station support, a $24,713 order in December 2025 for permanent option-period sanitation services, and a $13,750 order in February 2026 for portable latrine support at Camp Shelby. Service scope varies by order: the vendor supplies 2 to 300 portable units for durations ranging from 1-3 days to 15-31 days, scaling capacity to match training events, field exercises, and temporary deployments. Equipment includes portable latrines, handwashing stations, and associated rental, delivery, and maintenance support.

Activity has declined. The vendor averaged 20.5 awards per year from 2022–2024 (19, 24, and 18 awards respectively) but dropped to 9 in 2025 and only 3 in 2026. The combined potential value across all 123 recent awards totals $4.5 million with only $1.3 million obligated to date. Four awards face ultimate completion within the next twenty-four months, carrying $101 thousand in combined potential value and representing modest recompete exposure. The vendor has no subcontract footprint and holds no positions on government-wide vehicles or multi-agency IDIQs — all revenue derives from a single state-level defense customer's delivery orders against the parent IDC.

Rental and service of portable toilets, hand wash stations, hand sanitizers, holding tanks, restroom trailer.